Castle (Harvard): Heredity in Relation to Evolution and Animal Breeding (1913) Morgan, Sturtevant, Muller and Bridges (1915): Mechanism of Mendelian Heredity Bateson: (1902) Mendels Principles of Heredity, A Defense What is a model organism? What are its characteristics? Other model organisms in genetics How do they relate within a paradigm? What are the advantages of using model organisms? What can be their disadvantages?